Largest Mass. Companies Are Mostly Silent On GOP Tax Plans. Mihir Desai, December 6, 2017, Audio, “Corporations are the cornerstone of both the House and Senate versions of the tax overhaul. Both bills propose deep cuts in the corporate tax rate — from 35 percent to 20 percent. The bills also call for a territorial tax system to replace the current worldwide tax system, in which multinational corporations with headquarters in the United States are required to pay the U.S. tax rate if they want to bring profits back into the country.Link